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Chicago mayor yuks it up with host Jimmy Fallon, making good on his pact to appear on the talk show if Fallon did the Polar Plunge. NBC 5's Mary Ann Ahern reports. (Published Wednesday, June 4, 2014)

"The Tonight Show" could soon be Chicago-bound for the first time in more than a decade — but first, Chicago kids had better get cracking on cracking their books.

That's because Mayor Rahm Emanuel has extracted another promise from host Jimmy Fallon, this time with the "Tonight Show" host promising to bring the show back to the Second City if Chicago kids manage to read 2.4 million books this summer.

Top "Tonight Show" Moments

Fallon hesitantly took the mayor up on that challenge Tuesday when Emanuel appeared on his show.

The pair also reminisced Tuesday about the last challenge Emanuel gave Fallon — that of the Polar Plunge — and ribbed each other for how they handled what Emanuel admitted is "not a rational act."

Stars Steppin' Out

Emanuel and Fallon took that plunge into Lake Michigan in March to raise money for the Special Olympics, after Chicago kids topped the mayor's goal of 2 million books read.

Fallon described his own brush with hypothermia in the lake's icy waters as something akin to a near-death experience. "I heard bagpipes," he said. "When you're Irish, that's what you hear when you die."